Can someone identify this pipe for me?

[colheath]

Hi I'm trying to sort out a misfire in my disco (3.9 V8 engine) so while checking for splits in hoses I've found this one that seems to go nowhere...

this is a thing down there which the blue pipe connects to and there is a connector with nothing on it.  Should this non connected pipe be joined too? (sorry for the non technical description)  This is right hand side of engine bay  at the front under where the jack should be, as you're stood looking at it.

Any help would be great..

In fact if there are any v8 experts in the Stoke area who want to play with my engine  ;)

[clbarclay]

On my RRC there is a vacume reserviour located there. Its connected to the engine manifold to create the valcume and is used to operate the actuator working the fresh air/reciculate flap on the heater unit under the dash. To look at it was a spherical object with connectors for 2 small hoses to push onto.

I take it one of those pipes was from the engine. Does the other one disapear through the bulkhead to under the dash?

[colheath]

yes, the blue pipe runs up to the back then t's off, one part to the throttle assembly the other part carries on as you say through the bulkhead, I presume this is something to do with the cruise control?  The black pipe with one end not connected is going to a thing between the washer bottle and the air box (again apologies for lack of terminology)

[Yoshi]

Could it be the washer pipe for the front lights?

[colheath]

no it's not actually connected to the washer bottle, I'll get a picture, been trying to find it in the haynes book so I can give the name for it but no joy...

Ok my mystery black pipe goes to this thing in the middle of the picture with the screw, this is located between the air box and washer bottle.



So I'm wondering if the other end should indeed go down to that vacuum reservoir or if it should just be as it is not connected to anything?

[Yoshi]

To my untrained eye that looks like a component of an lpg system?? Think they call it the vaourizer, although i could be very very very wrong, in fact am most probably am! lol

[colheath]

it does have lpg so you could well be right, and that would explain why I can't find it in the manual...

[Yoshi]

Well i have only seen them in that kind of disc shaped, but about an inch, maybe inch and a half thick!

But i still could be wrong!

[colheath]

nope you're right  :dance: I've found it in the lpg installation pack that came with the car. 

it doesn't tell me if the pipe should be connected to anything though  :-k

[SteveGoodz]

Hi I'm trying to sort out a misfire in my disco (3.9 V8 engine) so while checking for splits in hoses I've found this one that seems to go nowhere...

this is a thing down there which the blue pipe connects to and there is a connector with nothing on it.  Should this non connected pipe be joined too? (sorry for the non technical description)  This is right hand side of engine bay  at the front under where the jack should be, as you're stood looking at it.

Any help would be great..

In fact if there are any v8 experts in the Stoke area who want to play with my engine  ;)

Ok, the thing mounted below the jack is the vacuum pump for the cruise control. It's the only thing that gets mounted there in a Disco. If your cruise is working then the black pipe doesn't go there. Where does the blue pipe go to? Is it possible that the black pipe has been replaced by the blue one and is now redundant?

[colheath]

Hi Steve, the blue pipe runs up to the back then t's off, one part to the throttle assembly the other part carries on through the bulkhead, I presume this is something to do with the cruise control (which doesn't work incidentally).  The black pipe goes to the thing that's now identified as something to do with the LPG so probably shouldn't be attached to anything else.

This raises a new question for me though: can you tell me how many pipes should there be coming off the vacuum pump?  It feels like there's an outlet there so that suggests to me there should be something connected to it or it should be blanked off, otherwise there's not a vacuum?

[300TDi Disco]

I'm not no expert on these engines but i have had so many problems with mine that now i have got an idea. What are you experiencing?

[SteveGoodz]

Hi Steve, the blue pipe runs up to the back then t's off, one part to the throttle assembly the other part carries on through the bulkhead, I presume this is something to do with the cruise control (which doesn't work incidentally).  The black pipe goes to the thing that's now identified as something to do with the LPG so probably shouldn't be attached to anything else.

This raises a new question for me though: can you tell me how many pipes should there be coming off the vacuum pump?  It feels like there's an outlet there so that suggests to me there should be something connected to it or it should be blanked off, otherwise there's not a vacuum?

It sounds to me like someone tried to diagnose the inoperative cruise control and decided to replace the hose rather than check the old one for splits. I've just checked my cruise control pump and it only has one pipe connected - the "empty" connection is probably the exhaust port (when the pump spins up and sucks the air out of the pipe it has to vent somewhere).

I don't think that round thing in your picture is the vapouriser for the LPG system - it looks too damned small. In any case the vap should have two water pipes and one gas inlet pipe and a gas outlet pipe to the plenum chamber inlet (all pretty big bore stuff). There's no reason to have any other pipes going to the vap (which should be about 10" diameter btw). I can't find anything on my motor that looks like what's in your picture - can you post a wider angle picture so I can see where abouts it is?

[colheath]

engine is misfiring, worse on petrol than gas, worst things is the emissions test failure  :( HD: 9,610ppm the guys at the garage said it should be under 1,000... then went on to do that sucking in noise "it could be this, it could be that, we can't tell you how much it will cost to put right blah blah" so I've been doing lots of reading, got the tools out and am getting oily and bleeding  :? strangely enjoying it too  :-k

Wider angle piccy...

it's there between the air box and the washer bottle...

[SteveGoodz]

Well, I'm no better informed than I was before  :shock: Has the LPG ever worked properly?

Do you mind if I borrow your picture and post it on an LPG forum? Somebody there might recognise it ...

[colheath]

to be honest when I first got the car I didn't notice anything wrong, then it started giving me starting probs which was traced to a couple of dodgy HT leads and a bad plug.  Replaced leads and plugs and all was well, then a month or so later it started running rough on petrol but seemed ok on gas.  Then it's gone for MOT and failed badly.  Now it's rough as hell on petrol and not much better on gas. 

Yes feel free to post the pic, I'd be interested to know if that pipe should be connected to something...

[muddyjames]

did you take it in for the mot on gas or petrol? They arent allowed to change it over and iirc gas should be near enough emissions free. Next time take it in on gas and leave it on gas.

a mate of mine did that as his petrol tank leeked so never used gas. Also meant he did fail the mot with a badly leeking petrol tank!  :lol: ;)